The synthesis of practice, researches and publications on "the Evaluation o
f Behaviour and Cognitive Therapies" allows us to review its usefulness on
philosophical, scientific, clinical, economic and political grounds. Huge p
rogresses in comprehensive of mental illnesses, in experimental methods, cl
inical outcomes and the extension of its indications are reported. The cons
equences of these improvements leads us to increase acceptability, knowledg
e and skills of professionals, to clarify the status of the psychotherapist
and to increase specific financial input for these therapies.